diff --git a/app.py b/app.py
index c41f644..23fc4a4 100644
--- a/app.py
+++ b/app.py
@@ -7,6 +7,7 @@
 import leafmap.maplibregl as leafmap
 import requests
 import geopandas as gpd
+import altair as alt
 
 st.set_page_config(page_title="Redlining & GBIF", layout="wide")
 st.title("Redlining & GBIF")
@@ -84,7 +85,6 @@
 @st.cache_data
 def compute_hexes(_gdf, gdf_name, rank, taxa, zoom, distinct_taxa = ""):
 
-    # FIXME check if dest exists in cache
     dest = unique_path(gdf_name, rank, taxa, zoom, distinct_taxa)
     bucket = "public-gbif"
     url = base_url + f"/{bucket}/" + dest
@@ -93,7 +93,10 @@ def compute_hexes(_gdf, gdf_name, rank, taxa, zoom, distinct_taxa = ""):
     if response.status_code != 404:
         return url
 
-    sel = con.read_parquet("s3://public-gbif/app/redlined_cities_gbif.parquet")
+    sel = (con
+           .read_parquet("s3://public-gbif/app/redlined_cities_gbif.parquet")
+           .filter(_[rank] == taxa)
+          )
 
     sel = (sel
            .rename(hex = "h" + str(zoom)) # h3 == 41,150 hexes.  h5 == 2,016,830 hexes
@@ -119,13 +122,14 @@ def compute_hexes(_gdf, gdf_name, rank, taxa, zoom, distinct_taxa = ""):
 
 
 
-import altair as alt
-
 @st.cache_data
 def bar_chart(gdf_name, rank, taxa, zoom, distinct_taxa = ""):
     sel = con.read_parquet("s3://public-gbif/app/redlined_cities_gbif.parquet")
-    sel = sel.filter(_[rank] == taxa)
-
+    sel = (sel
+           .filter(_[rank] == taxa)
+           .mutate(geom = _.geom.convert('EPSG:4326', 'ESRI:54009'))
+           .mutate(area = _.geom.area())
+          )
     if gdf_name != "All":
         sel = sel.filter(_.city == gdf_name)
 
@@ -136,7 +140,7 @@ def bar_chart(gdf_name, rank, taxa, zoom, distinct_taxa = ""):
     else:
         sel = sel.agg(n = _.count(), area = _.area.sum())
     sel = (sel
-      .mutate(density = _.n /_.area)
+      .mutate(density = _.n /_.area * 10000) # per hectre
       .group_by(_.grade)
       .agg(mean = _.density.mean(),sd = _.density.std())
       .order_by(_.mean.desc())
@@ -168,27 +172,30 @@ def bar_chart(gdf_name, rank, taxa, zoom, distinct_taxa = ""):
 mapcol, chartcol = st.columns([4,1])
 
 if submitted:
-    gdf = get_polygon(gdf_name, area_source, con)
-    url = compute_hexes(gdf, gdf_name, rank, taxa, zoom, distinct_taxa = distinct_taxa)
-    layer = HexagonLayer(url, v_scale)
-
-    
-    m = leafmap.Map(style=terrain_styling(), center=[-120, 37.6], zoom=2, pitch=35, bearing=10)
-    if gdf is not None:
-        m.add_gdf(gdf[[gdf.geometry.name]], "fill", paint = {"fill-opacity": 0.2}) # adds area of interest & zooms in
-    m.add_pmtiles(mappinginequality, style=redlines, visible=True, opacity = 0.9,  fit_bounds=False)
-    m.add_deck_layers([layer])
-    m.add_layer_control()
-
     with mapcol:
+        gdf = get_polygon(gdf_name, area_source, con)
+        url = compute_hexes(gdf, gdf_name, rank, taxa, zoom, distinct_taxa = distinct_taxa)
+        layer = HexagonLayer(url, v_scale)
+        digest = hashlib.md5(str(layer).encode()).hexdigest()
+        print(digest)
+
+        m = leafmap.Map(style=terrain_styling(), center=[-120, 37.6], zoom=2, pitch=35, bearing=10)
+        if gdf is not None:
+            m.add_gdf(gdf[[gdf.geometry.name]], "fill", paint = {"fill-opacity": 0.2}) # adds area of interest & zooms in
+        m.add_pmtiles(mappinginequality, style=redlines, visible=True, opacity = 0.9,  fit_bounds=False)
+        m.add_deck_layers([layer])
+        m.add_layer_control()
         m.to_streamlit()
+        
     with chartcol:
-        st.markdown("Mean number of " + count + " by redline grade")
         bar_chart(gdf_name, rank, taxa, zoom, distinct_taxa = distinct_taxa)
+        st.markdown("Mean density of " + count + " by redline grade, count per hectre")
 
 
+    
 st.divider()
 
+
 '''
 ## Overview
 
diff --git a/utilities.py b/utilities.py
index 2bb1866..95b355e 100644
--- a/utilities.py
+++ b/utilities.py
@@ -24,7 +24,7 @@ def set_source_secrets(con):
     if secret is None:
         secret = st.secrets["SOURCE_SECRET"]
 
-    ket = os.getenv("SOURCE_KEY")
+    key = os.getenv("SOURCE_KEY")
     if key is None:
         key = st.secrets["SOURCE_KEY"]
     
@@ -110,32 +110,6 @@ def HexagonLayer(data, v_scale = 1):
             get_fill_color="[255 - value, 255, value]",
             )
 
-def DeckGlobe(layer):
-    view_state = pdk.ViewState(latitude=51.47, longitude=0.45, zoom=0)
-    view = pdk.View(type="_GlobeView", controller=True, width=1000, height=600)
-    COUNTRIES = "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_50m_admin_0_scale_rank.geojson"
-    
-    layers = [
-        pdk.Layer(
-            "GeoJsonLayer",
-            id="base-map",
-            data=COUNTRIES,
-            stroked=False,
-            filled=True,
-            get_fill_color=[200, 200, 200],
-        ),
-        layer,
-    ]
-    deck = pdk.Deck(
-        views=[view],
-        initial_view_state=view_state,
-        layers=layers,
-        map_provider=None,
-        # Note that this must be set for the globe to be opaque
-        parameters={"cull": True},
-    )
-    return deck
-
 
 def terrain_styling():
     maptiler_key = os.getenv("MAPTILER_KEY")
@@ -192,7 +166,6 @@ def get_city(name = "Oakland", con = ibis.duckdb.connect()):
     return gdf 
 
 
-@st.cache_data
 def get_polygon(name = "New Haven", 
                 source = "City",
                 _con = ibis.duckdb.connect()):
@@ -211,9 +184,10 @@ def get_polygon(name = "New Haven",
 import pandas as pd
 def unique_path(gdf_name, rank, taxa, zoom, distinct_taxa):
     #gdf_hash = str(pd.util.hash_pandas_object(gdf).sum())
-    text = gdf_name + rank + taxa + str(zoom) + distinct_taxa
-    hash_object = hashlib.sha1(text.encode())
-    sig = hash_object.hexdigest()
+    text = [gdf_name, rank, taxa, str(zoom), distinct_taxa]
+    sig = "-".join(text)
+    print(sig)
+    sig = hashlib.sha1(sig.encode()).hexdigest()
     dest = "cache/gbif_" + sig + ".json"
     return dest